<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>圆角边框</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background-color: green;
            margin: 0 auto;
            
            /* border-radius: 100px; */

            /* 
            px或者百分比
            v1 四个角都一样
            v1，v2 左上右下一致，左下右上一致
            v1,v2,v3 左上，左下右上，右下
            v1,v2,v3,v4 顺时针
             */

             border-top-left-radius: 10px;
             /* 垂直在前，水平在后 */
             border-top-right-radius: 20px;
             border-bottom-left-radius: 30px;
             border-bottom-right-radius: 50px;

        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>